The Academy Award-winning “Frozen,” which has grossed more than $1 billion worldwide and is poised to surpass “Toy Story 3” as the No. 1 animated movie at the box office, went on sale Tuesday. However, Amazon didn’t include sales since then in its analysis.

Once purchases by people who actually waited until the DVD was available to watch are counted, “Frozen’s” record is likely to be a tough one to beat.

That’s particularly impressive given that overall DVD sales have been declining rapidly in the past few years. In 2013 alone, sales of DVDs and Blu-ray discs dropped 8% in the U.S., according to the Digital Entertainment Group, an industry trade group.

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